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If a, b, c, d are the coefficients of an...

If `a, b, c, d` are the coefficients of any four consecutive terms in the expansion of `(1 + x)^n, n inN,` such that `a(b + c) (c + d) + c(a + b)(b + c) = kb (a + b)(c + d)` find the value of k

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